If there is no drain on them, batteries don't self-discharge very fast. So let me ask, how long between trips? If it is only a month or so, and if you disconnected the battery before putting the TM in storage, you don't need to "charge up before a trip". If it is 6 months - well, that's something else. The key is to disconnect the battery (pull the fuse) so as to avoid phantom / parasitic loads. BTW, you can do an Advanced Search on these terms, and learn a lot.
Bill
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